The Premier League is considering whether to allow West Ham's
Javier Mascherano to join Liverpool.
Mascherano's registration documents were sent to the Premier League
before the transfer window closed.
But a Premier League statement said it wants to "take time to
satisfy itself with the proposed arrangements".
Fifa has granted dispensation for the Argentine, 22, to join
Liverpool even though he has already played for two clubs since 1
July last year.
Mascherano, who arrived at Upton Park with international team-mate
Carlos Tevez on 31 August, will not be able to play for Liverpool
while his transfer is under consideration.
"The Premier League can confirm that, in accordance with its rules,
Javier Mascherano's registration documents were received from
Liverpool FC prior to the transfer window closing," said the
Premier League statement.
"The board will consider the terms of the registration as quickly
as possible and notify the parties involved of its decision
accordingly."
Under Fifa's rules, a footballer cannot play competitively for more
than two different clubs between 1 July and 30 June the following
year.
Mascherano, 22, has already represented Corinthians and West Ham in
that time.
But Fifa said: "The Fifa single judge ruled that Javier Mascherano
is eligible to play in official matches with Liverpool with
immediate effect."
In the statement Fifa explained its ruling was determined partly
because the South American and European seasons overlap.
Mascherano has played only six minutes for West Ham since the
defeat at Tottenham on 22 October and had been desperate to leave
the club.